Pass system and region to system mapping

Pass system and region to the system mapping function to avoid redundant API calls.

src/components/RegionMap.tsx

@@ -135,7 +135,8 @@ export const RegionMap: React.FC<RegionMapProps> = ({
   }, [systems, focusSystem, isCompact]);
 
   const handleSystemClick = (systemName: string) => {
-    navigate(`/systems/${systemName}`);
+    // Pass the region name when navigating to a system
+    navigate(`/systems/${systemName}?region=${regionName}`);
   };
 
   const handleMouseDown = useCallback((e: React.MouseEvent) => {